US PATENT SUBCLASS 29 / 888.071
.~.~.~ Including forging or hammering

Current as of: June, 1999
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29 /   HD   METAL WORKING

592  DF  METHOD OF MECHANICAL MANUFACTURE {54}
888  DF  .~ Prime mover or fluid pump making {12}
888.07  DF  .~.~ Piston ring or piston packing making {6}
888.071.~.~.~ Including forging or hammering

DEFINITION

Classification: 29/888.071

Including forging or hammering:

(under subclass 888.07) Process wherein the manufactured ring is shaped or worked by compressive impact force which produces plastic deformation.